An interesting anecdote I listen to during a conference on eVTOL.
A long flight with an electrified 747 will require more power from the grid than Heathrow's electricity consumption for half a day.
Certainly. Infrastructure is actually one of the biggest technological challenges for flight electrification. This is one area where hydrogen / fuel cell might have a leg up since it can physically/geographically decouple the power distribution from the airport itself (whereas for battery electric, unless you want to swap tens of tons of batteries between flights, you need charging infrastructure at the airport itself- and charging many 747-sized planes simultaneously at C-rates of at least 1 would require an obscene amount of power).